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package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicTextFieldUI;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.beans.PropertyChangeEvent;


/**
 * Provides the Synth L&amp;F UI delegate for {@link javax.swing.JTextField}.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Shannon Hickey
 * @since 1.7
 */
public class SynthTextFieldUI extends BasicTextFieldUI implements SynthUI {

  private Handler handler = new Handler();
  private SynthStyle style;

  /**
   * Creates a UI for a JTextField.
   *
   * @param c the text field
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent c) {
    return new SynthTextFieldUI();
  }

  private void updateStyle(JTextComponent comp) {
    SynthContext context = getContext(comp, ENABLED);
    SynthStyle oldStyle = style;

    style = SynthLookAndFeel.updateStyle(context, this);

    if (style != oldStyle) {
      SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());

      if (oldStyle != null) {
        uninstallKeyboardActions();
        installKeyboardActions();
      }
    }
    context.dispose();
  }

  static void updateStyle(JTextComponent comp, SynthContext context,
      String prefix) {
    SynthStyle style = context.getStyle();

    Color color = comp.getCaretColor();
    if (color == null || color instanceof UIResource) {
      comp.setCaretColor(
          (Color) style.get(context, prefix + ".caretForeground"));
    }

    Color fg = comp.getForeground();
    if (fg == null || fg instanceof UIResource) {
      fg = style.getColorForState(context, ColorType.TEXT_FOREGROUND);
      if (fg != null) {
        comp.setForeground(fg);
      }
    }

    Object ar = style.get(context, prefix + ".caretAspectRatio");
    if (ar instanceof Number) {
      comp.putClientProperty("caretAspectRatio", ar);
    }

    context.setComponentState(SELECTED | FOCUSED);

    Color s = comp.getSelectionColor();
    if (s == null || s instanceof UIResource) {
      comp.setSelectionColor(
          style.getColor(context, ColorType.TEXT_BACKGROUND));
    }

    Color sfg = comp.getSelectedTextColor();
    if (sfg == null || sfg instanceof UIResource) {
      comp.setSelectedTextColor(
          style.getColor(context, ColorType.TEXT_FOREGROUND));
    }

    context.setComponentState(DISABLED);

    Color dfg = comp.getDisabledTextColor();
    if (dfg == null || dfg instanceof UIResource) {
      comp.setDisabledTextColor(
          style.getColor(context, ColorType.TEXT_FOREGROUND));
    }

    Insets margin = comp.getMargin();
    if (margin == null || margin instanceof UIResource) {
      margin = (Insets) style.get(context, prefix + ".margin");

      if (margin == null) {
        // Some places assume margins are non-null.
        margin = SynthLookAndFeel.EMPTY_UIRESOURCE_INSETS;
      }
      comp.setMargin(margin);
    }

    Caret caret = comp.getCaret();
    if (caret instanceof UIResource) {
      Object o = style.get(context, prefix + ".caretBlinkRate");
      if (o != null && o instanceof Integer) {
        Integer rate = (Integer) o;
        caret.setBlinkRate(rate.intValue());
      }
    }
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, SynthLookAndFeel.getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    SynthLookAndFeel.update(context, g);
    paintBackground(context, g, c);
    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component.
   * <p>This is routed to the {@link #paintSafely} method under
   * the guarantee that the model does not change from the view of this
   * thread while it is rendering (if the associated model is
   * derived from {@code AbstractDocument}).  This enables the
   * model to potentially be updated asynchronously.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
    super.paint(g, getComponent());
  }

  void paintBackground(SynthContext context, Graphics g, JComponent c) {
    context.getPainter().paintTextFieldBackground(context, g, 0, 0,
        c.getWidth(), c.getHeight());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    context.getPainter().paintTextFieldBorder(context, g, x, y, w, h);
  }

  /**
   * {@inheritDoc}
   * Overridden to do nothing.
   */
  @Override
  protected void paintBackground(Graphics g) {
    // Overriden to do nothing, all our painting is done from update/paint.
  }

  /**
   * This method gets called when a bound property is changed
   * on the associated JTextComponent.  This is a hook
   * which UI implementations may change to reflect how the
   * UI displays bound properties of JTextComponent subclasses.
   * This is implemented to do nothing (i.e. the response to
   * properties in JTextComponent itself are handled prior
   * to calling this method).
   *
   * @param evt the property change event
   */
  @Override
  protected void propertyChange(PropertyChangeEvent evt) {
    if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
      updateStyle((JTextComponent) evt.getSource());
    }
    super.propertyChange(evt);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installDefaults() {
    // Installs the text cursor on the component
    super.installDefaults();
    updateStyle(getComponent());
    getComponent().addFocusListener(handler);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallDefaults() {
    SynthContext context = getContext(getComponent(), ENABLED);

    getComponent().putClientProperty("caretAspectRatio", null);
    getComponent().removeFocusListener(handler);

    style.uninstallDefaults(context);
    context.dispose();
    style = null;
    super.uninstallDefaults();
  }

  private final class Handler implements FocusListener {

    public void focusGained(FocusEvent e) {
      getComponent().repaint();
    }

    public void focusLost(FocusEvent e) {
      getComponent().repaint();
    }
  }
}
